The BMW M2 is renowned for its thrilling performance, and at the heart of that experience lies the N55 engine. This isn’t just any N55; BMW meticulously reworked it to create a powerhouse capable of handling the M2’s demanding nature. Let’s explore the key enhancements that make the M2’s N55 a truly special engine.
Forged Internals for Enhanced Durability
To prepare the N55 for the rigors of the M2, BMW reinforced its core components. The engine received a forged crankshaft, forged connecting rods, and updated piston rings. These robust upgrades provide significantly greater strength and durability compared to the standard N55, ensuring the engine can withstand higher stresses and sustained high-performance driving.
Improved Oil and Cooling Systems for Peak Performance
BMW understood that maintaining optimal operating temperatures was crucial for the M2’s performance. To that end, the N55 in the M2 boasts a reshaped oil pan and a new oil drain pump, promoting better oil circulation under extreme conditions. The addition of supplementary oil coolers further ensures consistent power delivery, even during demanding track sessions. As BMW Product Manager for the M2, Jose Guerrero, explained, maintaining optimal oil and coolant temperatures is essential to prevent power loss, especially during the high-revving driving the M2 is built for.
Cast-Iron Cylinder Liners for Track Readiness
While spray-on cylinder liners suffice for everyday driving, BMW opted for more robust cast-iron liners in the M2’s N55. This change was driven by the need for increased durability during sustained high-performance use on racetracks. Guerrero emphasized the importance of this upgrade, stating that cast-iron liners are essential to prevent engine failure during intense track driving.
Optimized Airflow for Increased Power
The M2’s N55 also benefits from a redesigned exhaust manifold and intake plumbing. These modifications optimize airflow, contributing to the engine’s increased power output. While BMW hasn’t disclosed the exact boost pressure increase, it’s evident that these changes, along with the internal upgrades, result in a noticeable performance gain over the standard N55.
The N55 Legacy in the M2
BMW’s enhancements to the N55 for the M2 weren’t just about increasing power; they were about creating a more robust, durable, and reliable engine capable of handling the demands of enthusiastic drivers. The N55 already had a reputation for being a smooth, powerful, and characterful engine. In the M2, it solidifies its legacy as one of BMW’s all-time great engines, proving that even in the face of newer powerplants like the B58, it still has much to offer. The M2’s N55 is a testament to BMW’s commitment to performance and driving enjoyment. It’s a fitting tribute to an engine that has earned its place in BMW history.
BMW M2 N55 Engine Internals
